Income Taxes - Schedule of Income Tax (Benefit) Provision (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Income Tax Disclosure [Abstract]
Federal and state current income tax expense			$ 4.8	$ 7.4
Net deferred (benefit) expense			(4.1)	1.6
Impact of change in research credit estimates			1.1	(2.0)
Income tax provision	(0.2)	2.1	1.8	7.0
Cash paid for income taxes			$ 1.7	$ 4.9